MAX15022EVKIT+【PDF 19/28 页】KIT EVAL FOR MAX15022

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Dual, 4A/2A, 4MHz, Step-Down DC-DC

Regulator with Dual LDO Controllers

Type II: Compensation when f CO > f ZERO, ESR

When the f CO is greater than f ESR , a Type II compensa-

V OUT_

C CF

tion network provides the necessary closed-loop com-

pensated response. The Type II compensation network

provides a midband compensating zero and a high-fre-

R 1

R F

C F

quency pole (see Figures 5a and 5b).

R F C F provides the midband zero f MID,ZERO , and

R F C CF provides the high-frequency pole, f HIGH,POLE .

Use the following procedure to calculate the compen-

R 2

FB_

V REF

COMP_

sation network components.

Calculate the f ESR and LC double pole, f LC :

Figure 5a. Type II Compensation Network

f ESR =

f LC ≈

1

2 π × ESR × C OUT

1

2 π × L × C OUT

GAIN

(dB)

( )

where C OUT is the regulator output capacitor and ESR

is the series resistance of C OUT . See the Output-

Capacitor Selection section for more information on cal-

culating C OUT and ESR.

Set the compensator’s leading zero, f Z1 , at or below the

1ST ASYMPTOTE

( ω R 1 C F ) -1

2ND ASYMPTOTE

R F -1

R I

3RD ASYMPTOTE

( ω R F C CF ) -1

filter’s resonant double-pole frequency from:

f Z1 ≤ f LC

Set the compensator’s high-frequency pole, f P1 , at or

1ST POLE

(AT ORIGIN)

1ST ZERO

(R F C F ) -1

2ND POLE

(R F C CF ) -1

ω (rad/sec)

f P1 ≤ SW

Gain E/A = F

Gain MOD = 4(V/V) ×

×

4 × ESR x V FB

R F 4 × ESR x V FB

2 π × f CO OUT_

× L x V

below one-half the switching frequency, f SW :

f

2

To maximize the compensator’s phase lead, set the

desired crossover frequency, f CO , equal to the geomet-

ric mean of the compensator’s leading zero, f Z1 , and

high-frequency pole, f P1 , as follows:

f CO = f Z1 × f P1

Select the feedback resistor, R F , in the range of 3.3k ?

to 30k ? .

Calculate the gain of the modulator (Gain MOD )—com-

prised of the regulator’s PWM, LC filter, feedback divider,

and associated circuitry—at the desired crossover fre-

quency, f CO , using the following equation:

ESR [m ? ] V FB [V]

( 2 π × f CO [kHz] × L[ μ H] ) V OUT_ [V]

where V FB is the 0.6V (typ) FB_ input-voltage set-point,

L is the value of the regulator inductor, ESR is the

Figure 5b. Type II Compensation Network Response

series resistance of the output capacitor, and V OUT_ is

the desired output voltage.

The gain of the error amplifier (Gain E/A ) in the midband

frequencies is:

R [k ? ]

R 1 [k ? ]

The total loop gain is the product of the modulator gain

and the error amplifier gain at f CO and should be set

equal to 1 as follows:

Gain MOD x Gain E/A = 1

So:

? R F ? ? ?

? ? ? ?

20 × log 10 ? R 1 ? + 20 × log 10 ?? 2 π × f CO × L x V OUT_ ?? = 0dB

× = 1

R 1

______________________________________________________________________________________

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